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example(adc2): add example and test case for adc2.

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closes #461
This commit is contained in:
michael
2017-09-13 18:33:05 +08:00
parent 7c0020bfd0
commit d30f3e7aa8
6 changed files with 276 additions and 0 deletions
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59
examples/peripherals/adc2/main/adc2_example_main.c Normal file
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/* ADC2 Example
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "driver/dac.h"
#include "esp_system.h"
#include "esp_adc_cal.h"
#define DAC_EXAMPLE_CHANNEL CONFIG_DAC_EXAMPLE_CHANNEL
#define ADC2_EXAMPLE_CHANNEL CONFIG_ADC2_EXAMPLE_CHANNEL
void app_main(void)
{
uint8_t output_data=0;
int read_raw;
esp_err_t r;
gpio_num_t adc_gpio_num, dac_gpio_num;
assert( adc2_pad_get_io_num( ADC2_EXAMPLE_CHANNEL, &adc_gpio_num ) == ESP_OK );
assert( dac_pad_get_io_num( DAC_EXAMPLE_CHANNEL, &dac_gpio_num ) == ESP_OK );
printf("ADC channel %d @ GPIO %d, DAC channel %d @ GPIO %d.\n", ADC2_EXAMPLE_CHANNEL, adc_gpio_num,
DAC_EXAMPLE_CHANNEL, dac_gpio_num );
dac_output_enable( DAC_EXAMPLE_CHANNEL );
//be sure to do the init before using adc2.
printf("adc2_init...\n");
adc2_config_channel_atten( ADC2_EXAMPLE_CHANNEL, ADC_ATTEN_0db );
vTaskDelay(2 * portTICK_PERIOD_MS);
printf("start conversion.\n");
while(1) {
dac_output_voltage( DAC_EXAMPLE_CHANNEL, output_data++ );
r = adc2_get_raw( ADC2_EXAMPLE_CHANNEL, ADC_WIDTH_12Bit, &read_raw);
if ( r == ESP_OK ) {
printf("%d: %d\n", output_data, read_raw );
} else if ( r == ESP_ERR_INVALID_STATE ) {
printf("ADC2 not initialized yet.\n");
} else if ( r == ESP_ERR_TIMEOUT ) {
//This can not happen in this example. But if WiFi is in use, such error code could be returned.
printf("ADC2 is in use by Wi-Fi.\n");
}
vTaskDelay( 2 * portTICK_PERIOD_MS );
}
}